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This paper proposes a GPON-based transmission hierarchy (GTH) for mesh network. An OPNET testbed is constructed to test the performance of GTH on supporting metro aggregation service. From this testbed, the performance of the network and the terminals are got, which will definitely provide some references for optimizing GTH's usage in mesh network.
Most of Internet traffics are generated by peer-to-peer(P2P) file sharing applications. The main idea of P2P file sharing applications is that when a peer contributes a file with higher rate, the rate that the peer is able to download files from other peers will also be high. The mechanism works well in a bandwidth symmetric network. However, when a peer shares a large amount of files to other peers...
Measuring the land-mobile satellite channel by a channel sounder campaign involves in general massive costs. Using signals from GNSS instead could be considered as an opportunity providing large bandwidth, transmitter at accurately known positions and time synchronisation. The major drawback is the low received signal power such that features of the propagation channel might disappear in the noise...
In this paper, a QoS handoff decision scheme with ABC (always best connected) supported is proposed, and an optimal handoff solution of assigning N terminals to M access networks is found based on niche PSO algorithm. With help of gaming analysis, Pareto optimum under Nash equilibrium of user utility and network provider utility is achieved or approached for the found solution.
NGI (next generation Internet) needs to provide QoS (quality of service) routing and support ABC (always best connected). However, due to the difficulty on the exact measurement of the network status and the exact expression of the user QoS requirements, QoS routing scheme with ABC supported should be based on the fuzzy information. Meanwhile, with the gradual commercialization of the network operation,...
A new technology based on IEEE 802.16e should be applied for airport data link applications. To determine the most adequate parameters for the physical layer system design, it is important to consider the propagation channel characteristics. The paper presents results of the channel measurement campaign at Munich airport, in the C band. Using a test signal of 120 MHz bandwidth, large number of channel...
With the steady development of WiMAX based broadband wireless access networks, complete and accurate simulation studies become crucial. In an effort to further improve our ns-2 simulation model for mobile WiMAX, we have implemented a selective repeat automatic retransmission request (SR-ARQ) mechanism into our model and evaluated its performance and accuracy. In this paper, we present the design and...
IEEE802.16, as a wireless MAN broadband access standard, defines a flexible QoS mechanism in MAC layer for wild variety classes of services. However, it dose not define specific admission control strategy and scheduling algorithm, which are becoming the research hotspot in recent years. In this paper, we focus on the features of services defined in IEEE802.16, including UGS, ertPS, rtPS, nrtPS and...
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